The Mechanism of the Solute-Free Water Reabsorption Increase in the Rat Kidney by Oxytocin Saluresis. / Natochin, Yu V.; Shakhmatova, E. I.; Bogolepova, A. E.
In: Doklady Biochemistry and Biophysics, Vol. 497, No. 1, 01.03.2021, p. 95-98.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - The Mechanism of the Solute-Free Water Reabsorption Increase in the Rat Kidney by Oxytocin Saluresis
AU - Natochin, Yu V.
AU - Shakhmatova, E. I.
AU - Bogolepova, A. E.
PY - 2021/3/1
Y1 - 2021/3/1
N2 - Abstract: We found an experimental solution to the paradox when the reabsorption of solute-free water increases with a simultaneous increase in diuresis and saluresis in the rat kidney under the oxytocin action. Injection of oxytocin to rats (0.25 nmol/100 g of body weight) increases diuresis from 0.16 ± 0.03 to 0.26 ± 0.02 mL/h, the excretion of solutes from 134 ± 13.7 to 300 ± 16.3 μOsm/h, and the reabsorption of solute-free water, which correlates with the renal excretion of oxytocin (p < 0.001). The mechanism of the effect is that oxytocin decreases the reabsorption of ultrafiltrate in the proximal tubule (the clearance of lithium increases) and increases the fluid flow through the distal segment of the nephron. In vivarium rats, urine osmolality (1010 ± 137 mOsm/kg H2O) and the concentration of vasopressin are high, this causes an increase in the reabsorption of solute-free water. Thus, oxytocin increases saluresis, which, against the background of a high level of endogenous vasopressin, increases the water reabsorption in the collecting ducts.
AB - Abstract: We found an experimental solution to the paradox when the reabsorption of solute-free water increases with a simultaneous increase in diuresis and saluresis in the rat kidney under the oxytocin action. Injection of oxytocin to rats (0.25 nmol/100 g of body weight) increases diuresis from 0.16 ± 0.03 to 0.26 ± 0.02 mL/h, the excretion of solutes from 134 ± 13.7 to 300 ± 16.3 μOsm/h, and the reabsorption of solute-free water, which correlates with the renal excretion of oxytocin (p < 0.001). The mechanism of the effect is that oxytocin decreases the reabsorption of ultrafiltrate in the proximal tubule (the clearance of lithium increases) and increases the fluid flow through the distal segment of the nephron. In vivarium rats, urine osmolality (1010 ± 137 mOsm/kg H2O) and the concentration of vasopressin are high, this causes an increase in the reabsorption of solute-free water. Thus, oxytocin increases saluresis, which, against the background of a high level of endogenous vasopressin, increases the water reabsorption in the collecting ducts.
KW - kidney
KW - oxytocin
KW - reabsorption of solute-free water
KW - saluresis
KW - vasopressin
UR - http://www.scopus.com/inward/record.url?scp=85102207991&partnerID=8YFLogxK
U2 - 10.1134/S1607672921020113
DO - 10.1134/S1607672921020113
M3 - Article
C2 - 33666805
AN - SCOPUS:85102207991
VL - 497
SP - 95
EP - 98
JO - Doklady Biochemistry and Biophysics
JF - Doklady Biochemistry and Biophysics
SN - 1607-6729
IS - 1
ER -
ID: 110897785